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Novel polyimide microsphere slurry and coated diaphragm thereof

A technology of polyimide microspheres and polyimide, which is applied in the direction of structural parts, electrical components, battery pack parts, etc., can solve the problems of production efficiency decline, and achieve not easy to drop powder, good heat shrinkage resistance, good adhesion effect

Pending Publication Date: 2022-08-09
HANGZHOU INST OF ADVANCED MATERIAL BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, the patent CN 104993089A, the lithium-ion battery diaphragm is composed of a base film and an aramid coating coated on one or both sides of the base film, wherein the presence of the aramid coating improves the temperature resistance of the modified diaphragm, but the The method needs to dissolve the aramid fiber in advance, and then needs to prepare the coating through the coagulation bath pore-making technology, which will lead to a serious decline in production efficiency

Method used

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  • Novel polyimide microsphere slurry and coated diaphragm thereof
  • Novel polyimide microsphere slurry and coated diaphragm thereof
  • Novel polyimide microsphere slurry and coated diaphragm thereof

Examples

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Effect test

Embodiment 1

[0027] A pure polyimide microsphere-coated polyolefin diaphragm is formed by coating polyimide microspheres on the surface of a wet-process PE diaphragm by using a micro-recess coating process. The preparation method of the above-mentioned polyimide microsphere-coated PE diaphragm comprises the following steps:

[0028] (1) Preparation of polyimide microspheres: Weigh the monomer pyromellitic dianhydride (PMDA) and the monomer 4,4'-diaminodiphenyl ether (ODA) in a molar ratio of 1:1, take N, N-dimethylformamide (DMF) was used as a solvent, mixed and stirred, and the reaction conditions were controlled to prepare a polyamic acid solution with a solid content of 15% and an apparent viscosity of 80 cp. Polyamic acid microspheres were prepared by electrostatic spraying in an electric field with an electric field strength of 1 kV / cm, then placed in a high-temperature furnace for imidization, and naturally cooled to room temperature to obtain polyimide microspheres.

[0029] (2) Co...

Embodiment 2

[0033] A polyimide microsphere / ceramic mixed-coated polyolefin separator, which uses a micro-recess coating process to coat the surface of a wet PE separator with a polyimide microsphere slurry, the slurry also contains a certain proportion of Ceramic Nanoparticles. The preparation method of the above-mentioned polyimide microsphere / ceramic mixed-coated polyolefin diaphragm comprises the following steps:

[0034](1) Preparation of polyimide microspheres: Weigh the monomer pyromellitic dianhydride (PMDA) and the monomer 4,4'-diaminodiphenyl ether (ODA) in a molar ratio of 1:1, take N, N-dimethylformamide (DMF) was used as a solvent, mixed and stirred, and the reaction conditions were controlled to prepare a polyamic acid solution with a solid content of 15% and an apparent viscosity of 80 cp. Polyamic acid microspheres were prepared by electrostatic spraying in an electric field with an electric field strength of 1 kV / cm, then placed in a high-temperature furnace for imidizati...

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Abstract

The invention discloses novel polyimide microsphere slurry and a coated diaphragm thereof, and is applied to the field of lithium ion batteries. The slurry is composed of polyimide microspheres, inorganic particles, a binder, a surfactant, a dispersant and a solvent. The coating diaphragm is obtained by coating the slurry on the surface of at least one side of a porous base membrane in a manner of micro-concave coating, extrusion coating, transfer coating, dip coating or bar coating and then drying, and the coating diaphragm has excellent lithium dendrite puncture resistance and an effect of preventing short circuit in a battery by high-temperature hole closing. Compared with a common ceramic diaphragm, the novel polyimide microsphere slurry coated diaphragm provided by the invention has more excellent cohesiveness and thermal shrinkage resistance. The novel polyimide coated diaphragm has lower surface density than a ceramic coated diaphragm, and the energy density of the lithium ion battery is remarkably improved. The slurry and the diaphragm provided by the invention are adaptive to the existing mature diaphragm coating process, and have great application prospects.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery separators, and in particular relates to a novel polyimide microsphere slurry and a coated separator thereof. Background technique [0002] Lithium-ion batteries have outstanding advantages such as small size, light weight, high power density, long service life and environmental friendliness. They were initially mainly used in 3C products. In recent years, they have also been widely used in new energy vehicles, power tools and energy storage. development of. At present, lithium-ion batteries are developing in the direction of large capacity and high specific energy, and their safety has also received more and more attention. The poor thermal performance and electrolyte wettability of traditional polyolefin separators can no longer meet the needs of lithium-ion batteries. Therefore, the development of a new type of lithium-ion battery separator with high mechanical strength, high temp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/446H01M50/423H01M50/403H01M50/434H01M50/443H01M50/449H01M50/489H01M50/491
CPCH01M50/446H01M50/423H01M50/434H01M50/489H01M50/403H01M50/443H01M50/449H01M50/491Y02E60/10
Inventor 齐胜利于俊峰董南希田国峰武德珍
Owner HANGZHOU INST OF ADVANCED MATERIAL BEIJING UNIV OF CHEM TECH
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